The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Shi Xu:
Color Mail represents charming letters to you! Forget the tedious plain text mail, embrace your colorful life! Features 14 elegant papers 14 picked fonts 12 polished text colors Full functional rich text editor: bold/italic/underline, left/center/right/side alignment Easy to add customized links, list tags and image attachments